UpstateCivic

This is the third forum I've put this in, but I really need to know. I'm going next week to pick up my engine along with a couple others in Quebec. I've seen a couple posts on here stating that people were getting there engines stuck in customs, and I don't want this to happen to me. What are the necessary papers that I need to get and have filled out, and where do I get them? Is there anything else I have to do? Thanks guys, I appreciate it.